Add cryptography resources (#1957)

* Update 106-cryptography.md

Added content to learn what is Cryptography?

* Update content/roadmaps/112-blockchain/content/101-blockchain-general-knowledge/106-cryptography.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/112-blockchain/content/101-blockchain-general-knowledge/106-cryptography.md

@@ -6,3 +6,5 @@ Cryptography, or cryptology, is the practice and study of techniques for secure
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://en.wikipedia.org/wiki/Cryptography'>Cryptography</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.synopsys.com/glossary/what-is-cryptography.html'>What is Cryptography</BadgeLink>
 <BadgeLink badgeText='Watch' href='https://youtu.be/AQDCe585Lnc'>Asymmetric Encryption - Simply explained</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=6_Cxj5WKpIw'>What is Cryptography?</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=trHox1bN5es'>Learn Cryptography</BadgeLink>